1864. | Zoology and Physiology. 355 
with a mixed solution of sesquichloride of iron and chloride of copper. 
The paper after drying is ready to be exposed in the printing frame ; 
its sensitiveness is one-third greater than that of albuminized paper. 
Very little is seen on removing it from the printing frame, but it is par- 
tially developed by floating it on a solution containing sulphocyanide of 
potassium and a little sulphuric acid. The effect of this is to pre- 
cipitate white subsulphocyanide of copper, upon those parts of the 
paper upon which the light has acted. After washing for an hour or 
two, the picture can be obtained of different colours by dipping it into 
appropriate solutions. Thus, red prussiate of potash gives them an 
intense red hue; by acting on this with an acid solution of iron they 
become violet red, violet blue and black, and after coating them with 
albumen, it is impossible to discover any difference between them and 
the best silver proofs upon albuminized paper. 
X. ZOOLOGY AND PHYSIOLOGY. 
Tue French Academy, whose annual meeting took place at the close 
of the year, occupied itself with a tribute to the distinguished and 
lately deceased zoologist, André Dumeril, and then proceeded to an- 
nounce the prizes which it proposed to offer for the coming year, by 
means of which it may be hoped new impulse may be given to the 
‘various departments of science. The great Physical Science Prize of 
3,000 francs has been postponed from 1859 to 1st of September 1864 ; 
the subject is “‘ The Comparative Anatomy of the Nervous System of 
Fishes.” Another prize of the same value has been postponed from 
1861 to December 5lst 1865; the subject is, ‘‘The Production of 
Hybrid Animals by means of Artificial Fecundation.” A third prize 
of 3,000 franes is offered for the osteographical work which will best 
contribute to the advancement of French paleontology, to be sent in by 
Ist of November 1865. The Cuvier prize, to be awarded in 1866, 
will be given to the most remarkable work upon the Animal Kingdom, 
or upon Geology. ‘This prize is awarded every three years,—the 
funds arising from unemployed subscriptions to the statue of Cuvier ; 
it has just been awarded to Sir R. Murchison for his works upon the 
Paleozoic formations. Another Cuvier prize is also announced to be 
given to the author of the most remarkable work upon the Animal 
Kingdom, or on Geology, which shall appear between the 1st January 
1863 and the 3lst December 1865. The prize to consist of a gold 
medal, value 1,500 francs. Another prize, termed the Godard prize, 
of 1,000 franes, is given annually to the best paper on a physiological 
subject, which is this year left open. 
Although some of these prizes, owing to the extended character of 
the researches required, have been necessarily postponed from year to 
year, it is not therefore to be supposed that there are no competitors, 
or that this stimulus is offered in vain. Other prizes of a similar 
character were awarded at the meeting of the Academy, as the first 
