26 BULLETIN OF THE BUSSEY INSTITUTION. 
No. 8.— On the Agricultural Value of Spent Dye-woods 
and Tan. By F. H. Storer, Professor of Agricultural 
Chemistry. 
THE questions, how much, and what kind of value, as manure, have 
spent tan and dyewoods ? are still often asked, although a great deal 
of information that might serve for answering them has long since 
been published. J have endeavored to collect some of this scattered 
information and to re-enforce it by new analyses of several spent mate- 
rials, such as are accessible to many farmers in New England. 
The character of the substances examined under my direction will 
appear from the following statements. 
TANS AND SPENT TANS. 
I. Fresh, ground hemlock* bark from~- Moseley’s tannery, Win- 
chester, Mass. 
II. Spent tan from Moseley’s tannery, as above. 
III. Fresh, ground hemlock bark from the tannery of Waldmyer & 
Co., Winchester, Mass. 
IV. Spent tan, from Waldmyer & Co. 
V. Fresh, ground hemlock bark from the tannery of Blake, Higby, 
& Co., Woburn, Mass. 
VI. Spent tan, from the tannery of Shaw and Taylor, Woburn, 
Mass. 
All these specimens were obtained in July, 1875. ‘They were in 
the air-dried condition. The following results were obtained on ana- 
lyzing them. 
Fresh tans: I. III. y. Mean of the 
3 Analyses. 
Water, expelled at 105° to 110°C. 12.340, 11.20% 11.87 11.80 
Ash}; i ey Bes 1.39 1.74 1.57 
Phosphoric ay (P, O,) peas Ch od 0.0428 0.0358 0.0393 
EOtaS0 Ce ies jog 0.1423 0.1810 0.1055 0.1263 
Nitrogen . . «. . . ~ « ~0.111—0.158 0.200 0.225—0.235 0.186 
* Abies Canadensis of Michaux. 
