Mr. Jones: I think, Doctor, it is a matter of heat, because in the shade you can graft them almost any way. Do you cover the scion with paraffin or only the union?
Dr. Morris: I cover the entire thing with paraffin, scions, buds and all including the wrapping. I don't leave anything exposed to the air. There are several principles involved there. In the first place you have the effect of light upon chlorophyl which is important; in the second place, the melted paraffin fills all interstices in which sap would collect and ferment. If those interstices are filled with melted paraffin, sap will not collect there and ferment. The microbes of bacterial and fungus origin, that prevent union and break down the products of repair that are thrown out for the purpose of repair, can not do it if they can not collect in quantity, and the paraffin fills the space in which they would collect in quantity; so that does away with another one of the dangers. In the third place, you have the same sap tension maintained in the scion as in the stock. The difference between the negative and positive pressures, day and night, is very great in spring time, and as the sap responds between day and night in the stock, it puts a strain upon the scion. The scion can not follow the stock with its sap movement ordinarily. But if scion and stock are covered completely with paraffin, the tension remains the same, so that you do away with the shock of varying negative and positive pressures. That is an important point, it seems to me, in principle in the matter of using the paraffin. Another point is this. You prevent evaporation from scion that goes on ordinarily through the little breathing lenticels, the little apertures between the cells of the bark which allow moisture to escape as well as to enter. One would naturally believe the paraffin would fill these and smother the scion, and I presume it is that fear which has prevented the world from trying this for the past ten thousand years, because they were skilful grafters in Egypt, both in the tree world and the financial world, in the days of Hammurabi there were skilful grafters in both worlds two or three thousand years before Christ. I suppose that fear of closing the breathing apertures in the stock has prevented people from adopting this method; but it is not justified, because those bold, brave nurserymen who are not afraid to smother a scion find that all the scions live. It is a venture into the unknown, that dramatic book, in the way of dramatically constructive progress. Another point: When you protect your graft in the ordinary way with ordinary wrapping, ordinary wax, the scion becomes timid, the stock becomes timid. It is not quite sure of itself in many cases, and when it is not sure of itself, when it has a fear, what does it do? It resorts to the protection method. What is the first? Suberization, cork layer formation. So the frightened stock throws cork cells over its cut surface between that and the graft, and the suberization goes on as a result of fear on the part of the timid stock. When you have taken away the fear by covering the whole area with melted paraffin and it feels safe, then suberization does not go on in this way, your stock is not frightened, you have not a scared tree at all, and it will go on kindly and gently as a Jersey heifer to do its work.
President Reed: I would like to ask Dr. Morris about that myself. I am very much interested in the line of grafting, as we graft 50,000 to 100,000 every spring, using this same method. I feel as Mr. Jones does, that the losses from grafting are largely due to heat and the fermentation of sap. We find perhaps, that the first week of grafting in cherry, we can almost invariably secure a fairly good stand. Following that it tapers as the warmth and air increase, although the scions are kept in cold storage, perfectly dormant, the sap is coming up, and the increased rays of the sun—we get a very small percentage, and it seems to become less every day, and we have always used the dark wax. While I have been using paraffin wax a good deal of the time, I put lampblack in it for coloring.
Dr. Morris: I have until this year. In order to get Mr. Jones' points, I tried to work out the philosophy of the subject and see what values there are, what meanings in the methods which led to his success. Then following that line of investigation, I stopped into another line of observation, and arrived at the transparent paraffin method, so that this is the first year in which I have tried it, but the results are perfectly remarkable. I have only done it for a year, but you will see 100% of catches on almost everything, hickories, walnuts, hazels. I must tell you of one very remarkable incident. Mrs. Morris had some dwarf trees set out on the slope of the lawn, dwarf pear trees. One of my men cut one of them off with a lawn mower the latter part of August. The top kicked around under foot for three or four days, wilted in the sun. We were walking past it along in August. I think Mr. Bixby said, "Why don't you try grafting on that kind of material?" I said, "I will, blessed if I don't." So I cut three pear scions from this wilted top that had been cut by the lawnmower in August, and I put them on a scrub pear tree under the fence near the house. And I tried this paraffin method, and in about six days one of them started out a shoot, and I said to one of my men, "We will transplant this. This is no place for it." I meant in the spring, or in a year or so. He transplanted it the next day. And it grew I think about half an inch after that, made good wood to last through the winter. So I don't know what the limitations of this paraffin method are. But that is a thing I would hardly dare tell about unless there were men here in this room who had seen it. That little pear top, cut off by mistake, kicked about under foot a few days in August, no sort of scion that any one would ever think of using as a graft, put it in as a joke, and with the further abuse of being transplanted; but it started growth, and now it is going to be a good pear tree.
Mr. Jones: The kicking around only made it good for grafting.
President Reed: Perhaps it ripened up to a certain extent by that drying out, like it would in the fall.
Dr. Morris: Maybe, but I have never heard of horticulturists propagating trees in that way and transplanting them in the same year, and having the new wood from the graft harden for the winter.
Mr. Jones: Mr. Reed spoke of grafting a cherry. You cut the top off didn't you?
President Reed: Yes.
Mr. Jones: We graft filberts by leaving the top on and cut the graft in on the side and wax it over. We leave it there two weeks, maybe, and cut it off, and we get perfect stands that way, and you would on the cherry.