
1890.] Scientific News. 113 
While a preference will be given to demonstrations from human 
tissues, it will be possible for work in canine tissues to take the first 
and, indeed, all of the prizes. But of two slides equally well done in 
all respects, one canine the other human, the latter will be given the 
preference. Canine tissues should be from large animals. 
Twelve slides from young and twelve from aged tissues must be sub- 
mitted by each competitor, together with a full description of the sub- 
jects, methods pursued, and every detail and circumstance which is 
likely to throw light upon, or account for any peculiarity. The slides 
are for comparison as to the condition of capillary circulation, the 
young with the old, and should be in numbered pairs, or groups from 
the same kind of tissuc. The term tissue is used in a general sense, 
e. g., pulmonary tissue, hepatic tissue, renal tissue, osseous tissue, 
muscular tissue, nerve tissue, alimentary tissue, etc 
No particular schedule of methods for injection, or staining, will 
be insisted upon, and no more definite directions or explanations will 
be given. 
The slides, carefully packed and boxed, together with descriptive 
manuscript, can be sent by mail. 
It is stipulated that the demonstrations which receive the prizes, 
shall become the property of the subscriber, for publication. All 
others will be returned, if desired. 
No pseudonyms required. Accompany slides, in every case, with 
(real) name and address. Unless of known reputation as a biologist, 
a reference is respectfully solicited. 
Reservation : no reward will be made unless work of at least ordi- 
nary merit is submitted. 
This offer is made on the first day of January, 1890, and will remain 
open until the twentieth day of August, 1890. 
Slides and manuscript will be examined and receipted for as soon 
as received. 
The prizes will be adjudged on the first day of October, 1890. 
These nominal prizes are offered less in expectation of results from 
the money as an agent, than in the hope that the offer may furnish a 
point d'appui for really needed work. Besides professional observers 









_ playing with microscopes, as with toys, merely to see curious or pretty 
things. The time has come to concentrate observation upon the one 
proper object of biology, viz-, the renovation and prolongation ot 
- human life. Address C. A. STEPHENS’ LABORATORY, 
Am, Nat.—January.—8 Norway Lake, Maine. 
