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Show 162 MR. G. GULLIVER ON T H E MEASUREMENTS OF [Feb. 4, for the same reason a variation " in time." The time represented is the lifetime of the individual. Class. I. II. III. IV. V. For the aggregate of individuals forming a species, the characters of the object imitated during tbe lifetime of the individual are:- In space. Constant. Variable. Constant or variable. Constant or variable. In time. Constant. Constant. Vary once. Vary periodically. For each individual of tbe species, the characters of the object imitated during the lifetime of the individual are:- In space. Variable. In time. Constant or variable. 2. Measurements of the Red Blood-corpuscles of Batrachians. By GEORGE GULLIVER, F.R.S. [Received December 6, 1872.] A comparative view of the sizes of these corpuscles in several British and foreign Batrachians was given in m y 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 measurements 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-corpuscles so singularly large as those of the Batrachians. Of the Caeciliee we at present know nothing of these corpuscles. Will no travelling naturalist supply us with an account or specimens of them ? M y 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 |