October 23, 1896.] 



SCIENCE. 



603 



2. The pons-bend is increased by a fold 

 of the membranous roof of the brain which 

 coalesces and extends from the outside of 

 the brain-tube to meson. 



3. The thin walls of the cerebrum, the 

 tela and plexuses, are really laterally con- 

 tinuous with the membranous roof of the 

 diencephal. 



4. The dorsal and ventral zones of His 

 have not been identified in the forms 

 studied — cat, turtle, bird and Amphibia ; 

 rather the indications are of a segmental 

 arrangement of the parts of the brain with 

 a secondary formation of sulci which prob- 

 ably have a wide morphological signifi- 

 cance. 



10. 'A Note on the Membranous Roof of 

 the Prosencephal and Diencephal of Ga- 

 noids,' bj^B. F. Kingsbury ,was an interest- 

 ing discussion in the neurology of species 

 of fishes named below. Principal stress 

 was laid on the evaginations of membran- 

 ous roof of the ganoid brain — the paraphysis, 

 dorsal sack and epiphysis. He emphasized 

 the presence of a paraphysis, occurrence 

 and value of the ' dorsal sack ' and the ex- 

 istence of a second epiphj^sial structure in 

 the adult Amia and its innervation. The 

 forms discussed were Amia, Lepidosteus, Aci- 

 penser and Polyodon. 



.11. The same author followed with ^The 

 Structure and Morphology of the Oblongata 

 of Fishes.' He discussed the regions which 

 make up the dorsal portion of the oblongata 

 in Ganoids and Teleosts : (1) The spinal, 

 ascending Vth tract, (2) the homologue of 

 the fasciculus communis of the Amphibian 

 brain, (3) center for the auditory nerve 

 and the nerves of the lateral line system. 

 He referred also to the modifications of 

 these regions in Amia, Lepidosteus and Ad- 

 penser and in representatives of thirteen 

 families of Teleosts and the fusions that 

 occur. Two results may be mentioned: 

 the vagus nerve derives a small part of its 

 fibers from the spinal V tract (in some). 



The lobus vagi and lobus trigemini are but 

 differentiated parts of the same tract (/as- 

 cicuhis communis) . 



Mr. Kingbury's second paper concluded 

 the work of the morning session of Wednes- 

 day. The afternoon sessions opened by 

 two papers devoted to methods of science 

 teaching in the secondary schools : 



12. * Differentiation of work in Zoology — 

 in Secondary Schools,' by Wm. Orr, Jr., and 



13. ' Field Work and its Utility,' by Jas. 

 G. ISTeedham. 



Both papers were received with deep 

 interest and were discussed at length. That 

 the matter presented bids fair to receive due 

 attention in the future is attested by the 

 fact that a joint meeting of representatives 

 of Sections G and F agreed that it is desira- 

 ble at the next meeting of the Association 

 to have arranged in advance a joint meet- 

 ing of the Sections for the consideration of 

 questions relating to teaching, etc. The 

 plan was adopted by Section F. 



14. The above papers and discussions 

 were followed by an illustrated paper by 

 Miss Agnes M. Claypole on ' Appendages of 

 an Insect Embryo.' 



The form used was identified as Anurida 

 maritima Guerin, and was collected under 

 stones on the beach at Woods Holl, 

 Mass. It belongs to a wingless group of 

 Insecta, the Collembola, and is the first 

 form of the group as yet studied in micro- 

 scopic sections. 



The cleavage of the egg is complete, 

 holoblastic, a character belonging to this 

 group of insects only, all the others having 

 central cleavage. The appearance of the 

 appendages takes place very early, the 

 antennte being the first of the series ; follow- 

 ing the antennae is a pair of very small ap- 

 pendages on the body segment, carrying 

 what is well known to be the third brain 

 segment. Behind these the mandibles, 1st 

 maxillae and 2d maxillae appear successively, 

 in turn followed again by the thoracic ap- 



