. Report of the director . fertilizer materialswere analyzed last year. Of the so-called complete fertilizers,that is, those supplying nitrogen, phosphoric acid, and potash, about25 per cent of the samples examined failed to meet guaranties inall of the items of plant food nutrition, but on the basis of totalguarantees 90 per cent were met or exceeded. The differencebetween these two ratings is due to the fact that most of the Report of the Director 455 deficient samples fell below guarantee in one item, but met orexceeded it in the other two. The estimated commercial value ofdeficiencies exce
. Report of the director . fertilizer materialswere analyzed last year. Of the so-called complete fertilizers,that is, those supplying nitrogen, phosphoric acid, and potash, about25 per cent of the samples examined failed to meet guaranties inall of the items of plant food nutrition, but on the basis of totalguarantees 90 per cent were met or exceeded. The differencebetween these two ratings is due to the fact that most of the Report of the Director 455 deficient samples fell below guarantee in one item, but met orexceeded it in the other two. The estimated commercial value ofdeficiencies exceeded $ a ton in only 3 out of every 100 samplesexamined. Nutritive Properties Found in Tobacco Seed Chemical investigations on tobacco seed developed an unexpectedpicture of proteins and fat, both of which are being subjected tofurther study. To test the possible nutritive quality of these, acomplete series of feeding experiments on rats was a diet of 98 per cent tobacco seed, 2 per cent mineral salts, and. Figure 33. Female rat and five young reared on tobacco seed. 10 drops of codliver oil daily, rats have been reared to maturityand have reproduced not only one generation, but even a second,of normal offspring. It would seem that tobacco seed containsadequate proteins and fats and sufficient quantities of vitaminsB and E. It is deficient in vitamins A and D and also probably incertain inorganic salts. Similar experiments on pigeons have beensuccessful, and will be tried on chickens. Protein Chemistry A series of analyses of the insoluble proteins of protective animaltissues, usually designated as keratins, has been carried out. Thetissues studied include human hair, wool, feathers, and snake 456 Connecticut Experiment Station Bulletin 337 epidermis. In addition silk fibroin and the horn-like skeleton oftwo species of coral were examined. As a result of these studiesit has been possible to add an important modification to the defini-tion of this interesting an
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