Vegetable Stdtkh. 1 1 3 



cement, that it may the better now adhere : 

 When the cement is cold, I pull away the 

 gut , and fcrew on the glafs tubes. 



But finding fome inconvenience in this 

 hot cement (becaufe its heat kills the fap 

 veffels near the bark, as is evident by theif 

 being difcoloured) I have fince made ufeof 

 the cold cement of Bees-wax and Turpen- 

 tine, binding it f aft over with wet blad- 

 der and packthread, as in Exper. 34, 



Inftead of bra fs- collars, which fcrewed 

 into each other , I often (efpecially with the 

 Syphons in Exper. 37, and 38.) made ufe 

 of two brafs-collars, which were turned a 

 little tapering, fo that one entered and ex- 

 a&ly fitted the other. 



This joining of the two collars was ef- 

 fectually fecured from leaking, by firft a- 

 nointing them with a foft cement; and 

 they were fecured from being disjoined, by 

 the force of the afcending fap, by twilling 

 pack-thread round the protuberant knobs 

 on the fides of the collars, When I would 

 feparate the collars, I found it neceflary 

 (except in hot Sunfliine) to melt the foft 

 cement by applying hot irons on the out- 

 fide of the collars. 



I It 



