162 



M 



R. G. GULLIVER ON THE MEASITREMENTS OF [Feb. 4, 



for the same reason a variation "in time." The time represented is 

 the lifetime of the individual. 



2. Measurements of the Red Blood-corpuscles of Batrachians. 

 By George Gulliver, F.R.S. 



[Eeceived December 6, 1872.] 



A comparative view of the sizes of these corpuscles in several 

 British and foreign Batrachians was given in my lecture, July 15, 



1871, to the East Kent Natural-History Society, at Canterbury, as 

 noticed in the ' Quarterly Journal of Microscopical Science,' January 



1872, but without specification of the measurements. These are 

 now severally enumerated, with the addition of others relating to 

 such species as I have since examined. I know not that measure- 

 ments pertaining to so many Batrachian species have heretofore been 

 presented at one view, and all made by exactly the same means and 

 under the same conditions. Hence it is hoped that the following 

 Table may prove interesting, and induce zoologists to take every 

 opportunity of preserving and examining specimens of blood-cor- 

 puscles so singularly large as those of the Batrachians. Of the 

 Csecilise we at present know nothing of these corpuscles. Will no 

 travelling naturalist supply us with an account or specimens of them ? 

 My own measurements in the Batrachians have been confined entirely 

 to the species which are mentioned in the following Table, and which 

 I have met with alive in menageries and elsewhere. 



Having at Canterbury insufficient books on the historical part of 



