Vegetable Staikks. 1 1 3 



cement, that it may the better now adhere : 

 When the cement is cold, I pull away the 

 gut, and (crew on the glafs tubes. 



But finding fome inconvenience in this 

 hot cement (becaufe its heat kills the Tap 

 VeiTcls near the bark, as is evident by their 

 being difcoloured) I have ftnee made ufcof 

 the cold cement of Bees-wax and Turpen- 

 tine, binding it faft over with wet blad- 

 der and packthread, as in Expcr. 34. 



Inftead of brafs- collars, which fcrcwed 

 into each other , I often (cfpccially with the 

 Syphons in Exper. 37, and 3 3.) made ufc 

 of two brafs-collars, which were turned a 

 little tapering, fo that one entered and ex- 

 actly fitted the other. 



This joining of the two collars was ef- 

 fectually fecured from leaking, by fTrft a- 

 nointing them with a foft cement j and 

 they were fecured from being disjoined, by 

 the force of the afcending fap, by twifting 

 pack-thread round the protuberant knobs 

 on the fides of the collars. When I would 

 fcparatctbc coliars, I found it neceflary 

 (except in hot Sunfhine) to melt the foft 

 cement by applying hot irons on the out- 

 fide of the collars. 









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