cancer-doctress, finds it expedient to amuse the country with this dark and mysterious relation.
The water-eft has not, that I can discern, the least appearance of any gills; for want of which it is continually rising to the surface of the water to take in fresh air. I opened a big-bellied one indeed, and found it full of spawn. Not that this circumstance at all invalidates the assertion that they are larvæ; for the larvæ of insects are full of eggs, which they exclude the instant they enter their last state. The water-eft is continually climbing over the brims of the vessel, within which we keep it in water, and wandering away; and people every summer see numbers crawling out of the pools where they are hatched up the dry banks. There are varieties of them, differing in colour; and some have fins up their tail and back, and some have not.
note to letter xviii.
e1 ↑ The Gasterosteus pungitius is the ten-spined stickleback. The other is the common one with three spines.
LETTER XIX.
Dear Sir, I have now, past dispute, made out three distinct species of the willow-wrens (motacillæ trochili) which constantly and invariably use distinct notes. But at the same time I am obliged to confess that I know nothing of your willow-lark. In my letter of April 18th, I had told you peremptorily that I knew your willow-lark, but had not seen it then; but when I came to procure it, it proved in all respects a very motacilla trochilus, only that it is a size larger than the two other, and the yellow-green of the whole upper part of the body is more vivid, and the belly of a clearer white. I have specimens of the three sorts now lying before me, and can discern that there are three gradations of sizes, and that the least has black legs, and the other two flesh-
