32^ 



DI SE A SES 



Sect. XIV. 2. 4. 



ilream has paffed, occaflons the confequent vibrations of the air, which 



flitute found 



dible fpark of eledricity, or the 



tremendous craih of thunder. See Sedl. XIII. ->. 



4.^ The element of h^ght, as well as that of htat, is necelTary 



,.^^^^ they both feem in general to be inj 



getation. In th 



r 



only by their defe^, and feldom by their excefs. But as light ad 



dim 



th 



moi 



or fenfi 



appears by the expanfion of many fl 



the fun fhines on them 



: parts of plants, which 

 d of fome leaves, when 



d by the nutation >of the whole fl 



of the fu„-flou.er. helianthus ; a„d by the beading of the fummit; oj 

 ^" plants confined in houfes towards the li.ht : there may be dS 



been attended 



to 



g to the excefs of this ftimulus, whidi h 



prevent which the flowers of tragapogon falfafi 



fe abo . 

 to a defea of the fl: 



Other unobferved difeafes may be 



d of oth 



imuius 



of light 



mimofa, feniitive pi 



o 



which I had confined in a dark room, did not open it's folia<.e though 

 late .„ the. da,, ,,, ^ ^i,,^,,,,,,^ , ^^^ ^ ^^ ^^^f^ 



The excefs of hght hasr^ot been obferved to be attended by ^ 



-table difeafes in thefe 



thern latitud 



the difeafe pn 



duced by the d^eficiency of it, which is termed etiolation, or blanchino 

 has een fuccefsfally nfed to render fome vegetable leaves and ft Ik 

 - cu lent by depr.v.ng them of much of their acrimony, and of 



cohefi 

 celery, 



cram be 



ap 



well as of th 



d 



c ic h or 



as IS feen 

 5 cinara 



the blanching of 

 rdoon : fea-cale. 



The following . method of the growth and etiolation of fea 



fcribed from the letter of 



friend 



which fliould be added 



that the you.g heads of .his vegetable without b an i T Xu j 

 or lunerior to mnA ^;m^o ^r u ^■ , ^ . _ ^ '^^^ ^9^^^^ 



Superior to mofh kinds of brocoli, braffica 



be fowed the latter end of March 



and then earthed up 



or be 



^ ■■**'*^ 



Sea-cale feed fliould 

 of April in d 



bed 



'■} 



of 



In autumn it fbould be tranfplanted into bic^h 



a bed, about a foot afund 



nd 



in the 



winter 



