[ 532 ] 
15-93. Solarium Campechianum calycibus echinatls 
H. Elt. 360. 
Is94.. Soldanella Hort. Cliff. Alpina rotundifolia 
C.B. P. 295. 
15-97. Sonchus floribus folitariis, foliorumlaciniis ex- 
trorfum flexis Hort. Cliff. Sonchus Tin- 
gitanus papaveris folio T. 4.75*. 
15-96. Teucrium foliis lanceolatis integerrimis petio- 
latis, fpicis laxis fubrotundis Hort. Cliff. 
Polium lavendulas folio C. B. P. 220. 
1 5-97. Thevetia Hort. Cliff. Ahovas major Pif. 
15-98. Tordylium umbellulis remotis, foliis pinnatis 
pinnis fubrotundis laciniatis Hort. Cliff. 
15-99. Veronica fpicata lanuginofa & incana floribus 
casruleis Amman. Ruth. 
1600. Zigophyllum foliis fubfeffilibus Hort. Cliff. 
Fabago Africana arborefcens flore fulphureo, 
frudlu rot undo Com. Rar. 10. 
LXX. An Account of fome Experiments 
upon a Machine for meafuring the Way 
of a Ship at Sea . By Mr. J. Smeatoa, 
F. R. S. 
Head April 
* 754 - 
I N the Philo fophic at Tranfaftiom , N° 
391. for November 1725-. Mr. Henry 
de Saumarez gives an account of a machine for mea- 
furing a fhips way more exa&ly than by the log. 
This machine confifts of a firft mover, in the form of 
the letter Y. Upon the two arms of the Y are fatt- 
ened two vanes, inclined in fuch a manner, that when 
the 
