Spy-glass 30 inches long drawn out and 10 shut up, 1⅝-inch object glass, said to magnify 25 times. Price $7; for $8.50 in new subscriptions. Postage 50 cents—express may be less.
Two lenses mounted in brass; one of highest possible power for transparent objects; the other with larger field on stand for general use. Price of both together 50 cents. For 60 cents in new subscriptions.
Pocket Magnifying Glass, three lenses, horn case. Price 90 cents; for $1.10 in new subscriptions.
Square Reading-glass. Price $2; for $2.25 in new subscriptions. Postage 10 cents.
