Fig. 2.--A. Maxillary bone and fangs of one of the _Viperidæ_ (_Vipera russellii_) 8 B. Maxillary bone and fangs of one of the _Colubridæ_ (_Naja tripudians_) 8 C. Maxillary bone and fangs of one of the _Colubridæ_ (_Bungarus fasciatus_) 8 D. Maxillary bone and teeth of one of the non-poisonous _Colubridæ_ (_Ptyas mucosus_) 8 Fig. 3.--A. Fang of one of the _Viperidæ_ (_Vipera russellii_) 8 D. Transverse section of the fang 8 Fig. 4.--B. Fang of one of the _Colubridæ_ (_Naja tripudians_) 9 E. Transverse section 9 Fig. 5.--C. Fang of one of the _Hydrophiinæ_ (_Hydrophis pelamis_) 9 F. Transverse section 9 Fig. 6.--Three transverse sections of a poison-fang of one of the _Colubridæ_ 9 Fig. 7.--Marks produced on the skin by the bites of different species of snakes 10 Fig. 8.--Poison-gland and fangs of a venomous snake (_Naja tripudians_) 11 Fig. 9.--Muscular apparatus and poison-gland of _Vipera russellii_ 12 Fig. 10.--Muscular apparatus and poison-gland of _Vipera russellii_ 12 Fig. 11.--Muscular apparatus and poison-gland of _Naja tripudians_ 13 Fig. 12.--Muscular apparatus and poison-gland of _Naja tripudians_ 13 Fig. 13.--Arrangement of the scales of the head in one of the non-poisonous _Colubridæ_ (_Ptyas mucosus_) 14 Fig. 14.--Arrangement of the scales of the head in one of the poisonous _Colubridæ_ (_Naja tripudians_) 15 Fig. 15.--Feeding a poisonous snake (first stage) 18 Fig. 16.--Feeding a poisonous snake (second stage) 18 Fig. 17.--Capture of a _Naja tripudians_ (first stage) 19 Fig. 18.--Capture of a _Naja tripudians_ (second stage) 20 Fig. 19.--Hindu carrying two captured Cobras in “chatties” 21 Fig. 20.--Maxillary bone, mandible, and head of _Cœlopeltis monspessulana_ 23 Fig. 21.--(1) _Vipera berus_; (2) _Vipera aspis_; (3) _Vipera ammodytes_; (4) _Vipera ammodytes_ 25 Fig. 22.--_Vipera aspis_, from the Forest of Fontainebleau 28 Fig. 23.--Skull of _Bungarus_ 31