192 



study and comparison, to this he purposed to add a very small 

 collection of typical genera and species, exhibiting the natural 

 affinities of animals, — also a third collection, exhibiting the embry- 

 onic series of every animal type, — a fourth, embracing the domes- 

 ticated animals, to show what are species, varieties, breeds, &c., 

 with such products from them as have a commercial value, — and 

 finally, a museum of men, skulls, skeletons, &c., for the study of 

 the human races. 



Dr. B. J. Jeffries gave details of his experiments on 

 frogs, alluded to at the last meeting. 



In the first frog he injected 80 grains of sugar in 2 drachms of 

 distilled water ; seven hours after, by gas-light, there was no appar- 

 ent cataract ; it was then placed in water for twenty-two hours, 

 after which it was taken out and died in four hours ; eighteen hours 

 after death, the lens was examined, and a small amount of cata- 

 ract found on the posterior portion. In the second, the amount 

 of sugar was doubled ; it was kept from water six hours, and, no 

 cataract appearing by gas-light, put again into water, from which 

 it probably soon after escaped ; when found about eighteen hours 

 afterward it was very sluggish, and had by daylight strongly- 

 marked white cataract ; death took place three hours afterward, 

 twenty-four hours after which both lenses presented cataract most 

 strongly marked posteriorly ; that portion toward and about the 

 size of the pupil being free, giving the lenses the appearance of 

 glass beads. In the third, 220 grains were injected ; in two and 

 a half hours cataract was present, and the motions sluggish, and 

 by the end of the third hour death took place ; twenty -four hours 

 after death, an examination showed the same lesion as in the pre- 

 ceding case, only more decided ; the heart was found turgid with 

 blood. In none of these cases had the frogs natural cataract. In 

 connection with the remarks of Dr. Williams at the last meeting, 

 he spoke of a report in the Royal Opthalmic Hospital Journal, 

 for January, 1859, by Mr. France, of four cases of cataract asso- 

 ciated with diabetes, in one of which the urinary trouble was 

 diagnosticated from the cataracts. 



