Zoological Society. 208 excepting even the Camelidce. It is only during the earlier period of intra-uterine life that the corpuscle of mammals has a nucleus corre-sponding to the permanent one in the corpuscle of lower animals. In birds, the nucleus, when exposed by a weak acid, is commonly longer in proportion to its breadth than the envelope ; but there are some exceptions, and the nucleus becomes globular or nearly so when in contact with water. In the blood-corpuscle of mammals the central spot, so often mistaken for a nucleus, is not visible in the best focus and light ; then if the object-glass be so slightly removed from the corpuscles as not to destroy their clear contour, a dark spot appears in their centre ; if the glass be next so far moved towards the corpus-cles as to place them slightly within the focus, the dark spot will be-come bright ; and when altogether invisible in a bright light, the spot may be instantly brought into view simply by diminishing the light. Note. — The following measurements are all in vulgar fractions of an English inch ; but for the sake of convenience, the numerator is omitted throughout, as it is invariably 1, and the denominators only are printed. The measurements of the blood-discs are given as they lie fiat, unless when a T indicates a measurement of their thickness . By L.D. the long diameter and by S.D. the short diameter is de-noted. The measurements refer exclusively to average sizes. The nuclei were measured after exposing them by the action of dilute acetic acid on the envelopes. MAMMALIA. Homo 3200 T... 1 12400 SiMiJE Catarrhini. Simla Troglodytes Pithecus Satyrus Hylobates Hoolock leucogenys Rafflesii Semnopithecus Maurus Cercopithecus Mona .. sabaeus fuliginosus ruber pileatus ...-. pygery thrus — Petaurista — griseo-viridis — iEthiops Macacus radiatus — Rhesus — niger — cynomolgus — Silenus — nemestrinus — sylvanus — melanotus Cynocephalus Anubis . — leucophseus SiMi^ Platyrrhini. Ateles subpentadactylus .... 3412 3383 3368 3425 3539 3515 3468 3342 3530 3395 3578 3401 3478 3429 3454 3563 3429 3583 3429 3430 3493 3338 Ateles ater — Belzebuth .. Cebus Apella — capucinus ., Callithrix sciiireus Jacchus vulgaris .. Midas Rosalia Lemuridjs. Lemur albrfrons . -Catta — Anjuanensis — nigrifrons . Loris tardigradus . — gracilis .... Cheiroptera. Vespertlllo murlnus noctula ...... Piplstrellus ... Plecotus auritus ... 3461 3555 3620 Insectivora. Talpa Europaea .... Erinaceus Europaeus Sorex tetragonurus . Plantigrada. Meles vulgaris . . . Arctouyx collaris 3602 3589 3467 3454 3713 3624 3510 3976 4003 4440 3691 3461 4175 4404 4324 4465 4747 4085 4571 3940 3609
BioStor
