337 



l** Le mesurage et le repérage est le seul rationnel. 2*^ Les données 

 de tous les chariots universels sont nécessairement identiques. 

 30 Un même »chariot universel« bien construit est appliquable à tout 

 microscope, n'importe de quelle provenance et de quelle forme, et 

 transportable d'un microscope à l'autre. 



La limite que nous avions atteinte alors était une profondeur de 

 3,7 cm depuis la tige du statif jusq'au centre de la platine. 



Sans changement de la construction, en déplaçant seulement un 

 peu les règles de mesure, nous sommes parvenu aujourd'hui à adapter 

 notre «chariot universel« aux statifs qui n'ont que 3,0cm de profondeur. 



L'idée-mère du système, c. à. d. le mesurage rationnel au moyen 

 des coordonnées, et l'application du chariot à tout microscope, en par- 

 tant du centre optique coincidant avec l'origine des coordonnées, est 

 une idée que nous avons été le premier à énoncer. 



Le »chariot universel« fonctionne déjà depuis quelques mois à 

 l'Université de Louvain, à l'Université de Leiden, et à la Station zoo- 

 logique de Naples. 



Oudenbosch, 17. Avril 1898. 



2. Zoological Society of London. 



5tli April, 1898. — The Acting-Secretary read a report on the additions 

 that had been made to the Society's Menagerie during the month of March 

 1898, and called attention to an example of the Galapagan Tortoise [Testudo 

 galapagensis] ^ deposited by the Hon. Walter Rothschild, F.Z.S. — Mr. Old- 

 field Thomas exhibited and made remarks on some specimens of a Squir- 

 rel [Sciurus Finlaysoni) obtained by Mr. Stanley S. Flower at Ayiitha, Siam. 

 — Prof. Sydney J. Hickson, F.R.S., read a paper on the species of Corals 

 of the genus Millepora. The author stated that 39 species of the genus 

 Millepora had been described. A prolonged investigation of the characters 

 hitherto used for the determination of the species had proved them to be all 

 unsatisfactory. An examination of the soft parts of a great many specimens 

 of several forms of growth and from widely distant coasts had revealed no 

 features that could be used for separating species. In the author's opinion, 

 therefore, there was only one species of this genus now living, and that the 

 individuals of this species were capable of assuming a great variety of form, 

 according to the conditions in which tey lived. — A communication was 

 read by Mr. J. Stanley Gardiner containing an account of the Perforate 

 Corals collected by him in the South Pacific. Fifty-one species were treated 

 of, of which 15 were described as new. — Mr. Oldfield Thomas read the 

 description of a new Dik-dik allied to Madoqua Kirkii, but much larger, 

 which had been obtained by Mr. H. S. H. Cavendish in the region of Lake 

 Rudolf, and was proposed to be called Madoqua Cavendishii. — Mr. R. Lyd- 

 ekker, F.R.S., made some remarks on the Geographical Races of the 

 Banting [Bos sondaiciis)^ and suggested that the Burmese and Manipur forms 

 of this animal should be given subspecific rank, for which he proposed the 

 respectives names of Bos sondaieus hirmanicus and B. s. Woodi. 



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