Paper, 'Some observations made on the spawn of froggs and of the production of todpoles therein' by Richard Waller Waller writes on frogspawn and tadpoles. He describes how he observed frogspawn in a pot of water on his windowsill over a period of four weeks. Includes one page of figures showing stages of the tadpole life cycle. Subject: Zoology / Herpetology Published in Philosophical Transactions as 'Some observations made on the spawn of frogs, and of the production of todpoles therein, by the Learned and Curious Richard Waller, Esq; Reg. S. Secret' Read to the Royal Society on 17 December 1690 December 1690