1891.] Contents. vii 
Sponges; Notes on Earthworms; Teredos in Telegraph een ; Scarcity 
of Oysters; Hermaphroditic Anlage in Insects; Studies on the Wrist 
and Ankle; Skull of Sharks; g> Saep nA: Stejneger on ars lenti- 
ginosus ee ; Notes on the Clawed Frog, Xenopus ; Anat tomy of 
Heloderma; Birds; The Name of an Kangaroo ; Possibl nee of 
the Wolverine i in Ohio a Sa Se ee a ee a ee ey 1200 - 

Embryology : A etait ae of Heredity and Variation, 85— 
The Placentation of the Hedge-Hog and the Phylogeny of the Placenta, 
3876—The Continuity of the Prim: g Matrix of the Scales and the Ac- 
ee of Teleosts, 489—Prof. Weismann on the Tra saps oa of 
Acquired be ilepsy , 586— —Homologues in Embryo Hemiptera of the 
Appendages of the First Abdominal Segment of nas Insect Embryos ; 
Denevsaichi on the Fanali of tba Ga NO oT a aa 644 
rrent ; Effects of Ato on the Chorda irasra 
ali t k 
Functions of Mammalian Sympathetic keea ia, 193—Electrical Phe- 
nomena in Beating rege Relation of Nerve-Fibres and Ganglion Cells ; 
bs anar (ae Prize, 379—Heart-Sounds: Mechanism of Tricuspid 
Valve ; Innervation 1 of Renal a Vessels; bade ges. of the Heart 
a the ‘Snake, 648— —Temperatu rves ; Neuroke: ii rat te 
ess of Joints; te th è Self Regulation of Tana , 1086—Ti 
Relations of Menta Trae rs Text-Book of Pinki: ; 
The Brain of Laura Peagwien: en “of Sensory Fibres Ar esa 1207 

Entomology: Rectal Glands ia or 100— h (Zilus- 
trated), 200—Recent Literature; A New Phalangium iceaebie ; Injur- 
ies to Buffalo Tree Hopper latratd The Maple-Bark Louse, 782— 
ng-legged Harv 
er (Ilustrated); ner Plants of as 
jover-Stem Borer ; pty i omic Entomol t Lite 
re, 866Entome ogy et ra 
70—An Outlet for Memoirs, Monographs, and Faunal Lists ; 
Parasites, 1088—Meeting of Economie Entomologists 
= 
Worm; North American Phycitidæ; New Foot-Plant of Rheiobanas 
13-punctatus (illustrated) ; Elm m ea eee 1211 

Psychology: The American Society for Psychical Research, 284—The 
Effect of Whistling on Seals, 382—Jastrow on a Writing Test. . 973 
ie Microscopy : Certain Improvements in Born’s Method of Reconstructing 
Objects from Serial Sections; Katschenko’s Apparatus, 98—Professor 
Biitschli’s Sereinent ntal Imitation of Protoplasmic Movement, 492— 
Methods for the Preservation of Marine Organisms Employed at ae 
i —Dem vbromoso 
i 
Caryokinetic eure: Direct Division of the we: Spermatoge- 
nesis in the Hermaphrodite Gland of Limar agr: ; Con, njugation in 
: e Sooners 984—Lumbricus, Egg-Laying, mat p Preparstins of the 
aes Embryos of Lumbricus, 1100- Diret pees Asemeni of the Nucleus in the 
er Enteric Epithelin m of Rhabdonema ; Culture of the 
Laryæ idians, Worms, Echinoderms, T. ; Preservation of 
Siphonophora ; For T racing Nerve-Fibres in the Brain ; New Method 
of Staining Nerves with Methylblue......-..-+.++-+- 1217 


