[342]

Giard, C. R. Soc. Biol. v. 1893, p. 473.

[343]

See M‘Intosh, Ann. Mag. Nat. Hist. (ser. 4) ii. 1868, p. 276.

[344]

Lankester has suggested that a strong acid is secreted for the purpose, see Ann. Mag. Nat. Hist. (ser. 4) i. 1868, p. 233.

[345]

M‘Intosh, Ann. Mag. Nat. Hist. (ser. 6) xiii. 1894, p. 1.

[346]

Dalyell, The Powers of the Creator revealed, ii. 1853, p. 217.