106 Mr. Haworth's Twelfth Decade of New Succulent Plants. 



rate, must have been sent on the first of the sixty days to the 

 vessel which it was to direct, with a less rate than 5", at which 

 it was then going. We will, however, take it at 5" ; then with 

 precisely the same daily increase, &c. in its rate, which is 

 given it for the sixty days, it will at the end of six months be 

 2' 50"'4 in error, or upwards of forty miles of longitude. What 

 can our tippling philosopher say to this ? If he has no better 

 time-piece than this to direct his motions, he will in about six 

 years be going to Liquorpond-street half an hour too late, at 

 the risk of being fined a gallon of treble X. 



In the rates for the sixty days as given, No. 1 would be in 

 error at the sixtieth day 56"-8, or more than fourteen miles in 

 longitude, without taking any notice of the variation in the rate ; 

 whereas No. 2, as before stated, would not have one mile error. 



Should there be any opportunity of getting a new rate for 

 these watches, the i-esult will not be much more satisfactory. 

 Let us take the chances from their going for the sixty days, and 

 if we take new rates for every 15, 20, and 30 days, the 

 watch No. 2 still maintains the superiority. 

 Rate for each 1 5 days. Rate for each 20 days. Rate for each 30 days. 



In fact. No. 2 is invaluable, and No. 1 of no use except for 

 short voyages. I have only to add that our Liquorpond- 

 street friend ought to give us the " original document ;" the 

 subject is an interesting one : and although he says this docu- 

 ment is " much too sublime for our vulgar ears," yet as it ap- 

 pears to be perfectly correct in its application in the present 

 instance (the only one I believe ever brought against it), it is 

 certainly to be presumed innocent until proved guilty. 

 Januarys, 1830. F. K. 



XV. Decas duodecima Novarum Plantarum Succulentarum ; 



Autore A. H. Haworth, Soc. Linn. Lond. — Soc. Hortictdt. 



Loud. — 8oc. Cces. Nat. Curios. Mosc. — necno7i Soc. Reg. Ho7- 



ticidt. Belgic. Socius : S^c. <§-c. 



To the Editors of the Philosophical MagHzine a?id Annals. 

 Gentlemen, 

 IITEREWITH I transmit you my twelfth Decade of New 

 "■--■■ Succulent Plants, which consists of ten new species of 

 DeCandoUe's new and remarkable Natural Order of Cacte^, 

 whose botanical characters are given in the third volume of 

 his excellent Prodromus Regni Vegetabilis. 



The 



