Cheese.—When milk is curdled, it separates into two portions, curd and whey. The former consists of the butter and casein, and produces cheese; the latter is mainly water, with the sugar and mineral constituents of the milk in solution. Milk for cheese-making, which is more or less rich in cream, according to the kind of cheese, is placed in vats at a temperature varying from about 70° to 85° F., with the due amounts of rennet and colouring matter, for 1-1½ hour under cover. The rennet must be prepared from perfectly fresh (untainted) calves’ veils soaked in soft water—the halves of 1½ veils steeped in ½ gal. water will suffice for 250 lb. of cheese. The best colour is liquid arnatto, ½ fl. oz. to 25 lb. cheese.
As soon as the curd has set, say 1-1½ hour, the curd is “cut” by a special implement and broken up by the hand, a process demanding much skill and care. This completed, the curd is subjected to pressure, with the object of expressing the whey, which latter is drained off. The pressure is increased and judiciously regulated as the curd hardens, so as to remove all the whey without losing any butter. Various appliances are in use for this purpose. When the curd has been thoroughly freed from whey, it is broken up, salted in due proportion, and again submitted to repeated and increasing pressings. Finally it goes into the curing room to ripen.
Rennet.—Rennet is easily made at home, and costs less than half what the same quantity is charged when bought ready-made. Home-made rennet is also much stronger than the bought preparation and is useful in making summer delicacies. Get a calf’s maw from a butcher. They always keep them on hand, and charge about 1s. each. Tie the skin tightly at one end, with a double loop of twine, and leave it in a dairy or cool larder. When you want rennet, cut a piece about 1 in. square, and soak it in a teacupful warm water all night. Next day, take out the bit of maw, and to 1 pint cream or milk, use 1 large tablespoonful of the liquid. As a rule, the Gloucestershire cheese-makers do not manufacture their own rennet but buy it ready prepared. The kind generally employed is Hansen’s Patent Rennet Extract, which is used in the proportion of 1 teaspoonful extract to 6 gal. milk.
Cream Cheese.—Take ½ pint very richest cream and a cheese cloth. Pour the cream into the cloth, and lay it upon one of your dairy pans for an hour. Then take a perfectly clean knife and scrape off any cream that may have stuck to the cloth, and lay it on the top and sides of the cheese. Tie it up somewhat loosely, and hang it up to drip; open it from time to time, and remove any cream that has stuck to the cloth, and place it as before. When it stops dripping the cheese is ready, and will turn out easily. The cheese should always be used the same day it is made. In summer a few hours will suffice. If you tell your dairywoman the day before, she will have thicker cream for the cheese by keeping some of the milk that is set for cream 12 hours or more beyond the usual time for ordinary purposes before skimming it. The quantity of cream depends of course on the number of your party; ½ pint is enough for 6-8 people. If the cream be rich and the cheese well made, it will be soft, but without losing its round shape in the least. Though tied up loosely at first, it should be gradually tightened, after being opened from time to time as directed above.
New-milk Cheese.—Mix 4 gal. new milk with a breakfastcupful of salt, and a small teacupful of prepared essence of rennet. The milk should be used warm as it comes from the cow, or, if it has cooled, all or a part of it should be heated again, so that the whole marks about 95°F. The cheese is better if a pint or more of cream is added to the milk, but it is not necessary. The curd and the cheese will be hard if the milk is too hot. After about 2 hours the curd will have set. It should then be slashed across in all directions, and some of the whey ladled out with a cup. Next the curd should be drained in a cloth laid over a colander, and then put into a wooden or tin cheese mould in layers, with salt between. This should not be done until the curd is fairly dry. The mould should be covered and turned every day. Only a very light weight (if any) should be laid over. At the end of 2 weeks the cheese should be put in a muslin bag, and hung up in an airy, dry place, where the sun cannot reach it. Late in the year try half or a third this quantity, as, though there is more waste in a small cheese, it ripens quicker. May and June are the best cheesemaking months. Cheese moulds are generally round or cylinder shaped; but any strong box of wood, with gimlet holes at top, bottom, and sides, and a lid that fits inside and not over (so that as the cheese shrinks it still presses on it), will do for a makeshift.
Rush Cream Cheese.—To 1 pint thick, fresh cream, add ½ pint new milk, warm from the cow, 1 teaspoonful pounded loaf sugar, and 1 tablespoonful rennet. Let it remain near the fire till it turns to curd. Take the curd up with an egg slice, and fill the rush shape, made as directed, and covered with a piece of straining cloth inside. Lay a ¼ lb. weight on a saucer over the curd the first day; afterwards a ½ lb. weight. Change the cloth every day until the cheese is firm and begins to look mellow. Then dispense with the cloths, and return the cheese to the rush shape and leave it to ripen there. It may be ripened more quickly by keeping it from first to last in a tolerably warm room. Although cream cheeses are generally considered to be only in season during the summer, there is no reason why they cannot be as readily made at any time of the year, and of late they have come to be considered an almost indispensable delicacy at a fashionable dinner-table. A little extra trouble is all that is needed to ensure success. The cream and milk must be made rather more than new milk warmth, and if rennet is used, the cream must be covered and put in a warm place until the curd is come. During the whole process the temperature should never be lower than 65°F.
Sage Cheese.—This is made by colouring the milk with juice pressed from young red sage leaves and spinach. It should be added with the rennet to the milk.
Much obscurity has hitherto hung around the natural processes concerned in the development of flavour in cheese. Cheeses of different districts and of different countries possess (apart from mere richness due to the quantity of cream fat contained) each a piquancy characteristic of itself, which the differences in the mode of manufacture appear frequently much too slight to adequately account for. In the cheese-making districts of the Continent, however, this matter has been made the subject of scientific investigations; and already results are forthcoming which throw much light upon the subject. Among these, the researches of Duclaux, at the dairy station at Fau, Cantal, France, deserve particular attention, from the suggestiveness of the conclusions adduced. This savant has succeeded in isolating and in studying the life history of certain microscopic organisms (microbia), in which he recognises the primary agent that is engaged in modifying the constituents of cheese. These organisms are nourished by the casein or curd of the cheese, which they break up into a number of substances of simpler constitution, some of which, like the fatty acids, are characterised by highly piquant qualities. There are several ferments which produce these odorous principles in different proportions, and thus give rise to the differently flavoured cheeses; and the skill of the dairyman largely consists (though he does not know it) in always employing the same ferments or ripening agents, and in preventing other and less desirable organisms from gaining a foothold. Fortunately, in course of time, the useful ferments establish themselves in large quantities in the dairy; they impregnate the air of the factory, and cling to the vessels and the clothing of the operatives. From the moment the milk is drawn, it becomes exposed to the influence of these germs, which, developing rapidly in the warm milk, and becoming entangled in the curd when the rennet is added, accompany it through the operations that follow. On the Continent it appears common to curdle the milk at a much higher temperature than we do. Duclaux speaks of the rennet being frequently added just as the milk comes from the cow; and if it has been allowed to cool, it is warmed up to the natural temperature, 95°-98° F.
In making fine cheeses but little rennet is used, and the coagulation takes a long time. The curd is soft and full of whey, which is drained off slowly and as completely as possible, in order to get rid of the milk sugar. That which is left is chiefly converted into lactic acid, which renders the new cheese slightly acid. Soon, however, the casein ferments begin to develop over the surface of the cheese, giving rise to carbonate of ammonia, which neutralises the acid, and leaves the cheese in the end slightly alkaline. From the living cells of the ferment are at the same time secreted a diastase similar to the active principle which in malt, and in all germinating seeds, converts the starch into sugar. This penetrates the curd little by little, and renders it soluble, and thus a yellow translucent layer creeps gradually inward to the centre, and replaces the white and opaque casein. When isolated, this diastase attacked curd so strongly as to reduce it in 3 or 4 days to the consistency and appearance of Camembert cheese; but, as the flavouring organisms were absent, the resulting product was insipid and tasteless. This action resembles strongly the digestion to which the cheese is afterwards more completely subjected in the body. Indeed, the similarity in properties between this peculiar principle and the ferment of the pancreas is very marked. Simultaneously with the digestive diastase there is also secreted a diastase capable of coagulating the casein; but the cheese maker does not wait for this to be developed, but adds to the milk some rennet, which is a solution containing this diastase in considerable quantity. Such, in short, is the rationale of cheese curing—first, an organised ferment decomposes the curd, and produces in small quantities highly flavoured compounds, which, like a condiment, give relish to the whole mass; and secondly, a diastase, or unorganised ferment secreted by the organism, mellows the curd and renders it more easily soluble.