C 760 ) 
To examine yet farther this matter of new-made Air, 
I took one Grain weight of Crabs Eyes, to which I 
poured Wine Vinegar, and in 4 hours as much Air was 
generated as filled the fpace ot 44 Grains of Water ; and 
3 Grains of Crabs-Eyes produced about three times 
as much. This new-made Air kept its Expanfion for 12 
hours that I obferved it, whence it appears to have been 
true Air. 
V. The Defcription of the American Tomineius, 
or Humming Bird, communicated by Nehe- 
niiah Grew, Af. L). and FelLw of the Royal 
Society. 
THere is in mod parts of America a Bird called by 
the Englijh the Hum Bird, by the Spaniard To- 
rnineius. He is of a moil excellent lhining green Color, 
and very refplendent ; the Colour doth Tbmething re- 
ferable fome of our Englijh Drakes-heads. It doth inha- 
bit in fome of the colder parts of America, as v\ ell as in 
the hotter. It is the leaft of all Birds that I have feen 
there or in England; her Leg and Foot together is but 
iialf an Inch, the other pansanfwerable, the Trunk of 
her Body not an Inch. I did weigh one (in thofe parts) 
as foon as ever it was kill'd, whole Weight was the tenth 
part of an Ounce Avoir dupoize, which I take to be a- 
bout the Weight of £ Coined Six-pence. And I have 
weighed here in England a Tit-moufe (which I take to 
be the leaft Bird here) and it weighed above Two Shil- 
lings, and fome Half a Crown. I few one of their ^ 
Nefts made of Cotton- Wool, in form andbigaefs of the j 
Thumb 
