338 Mr Lindsay's Report on Open-Air Vegetation, [sess. lii. 



frosts except this retardation of growth. The thermometer 

 fell below the freezing point on eleven occasions; the lowest 

 readings were registered on the 1st, 5th, 7th, 8th, and 9th of 

 the month, when the glass fell to 25°, 26°, 26°, 25°, and 22° 

 respectively. The lowest day temperature for April was 

 42°, which took place on the 23rd, and the highest day 

 temperature was 64°, on tlie l7th of the month. Tlie total 

 amount of frost for tlie month is tlie same as for April last 

 year, viz., 58°. 



The collective amount of frost registered this season up to 

 the end of April, is 589°, as against 520° for the same period 

 last year. The following is the distribution for each month : 

 — October, 31°; November, 49°; December, 132°; January, 

 67°; February, 121°; March, 131°; April, 58°. The 

 lowest ])oint reached this season was 9° Fahr., or 23° of 

 frost, which occurred on February 16. 



On the Eock Garden 137 species and varieties of ])lants 

 came into flower during the montli, being twenty-two 

 less than for last April. Amongst the most conspicuous 

 were : — 



Andi'osace Laggerii. 

 Aubrietia Leichtlini, vav. 



„ Hendersoni. 

 Anemone fulgens, 



„ Robinsoniana. 



„ Pulsatilla. 

 Dentaria pentaphylla. 



„ triphyllu. 

 Daphne Blagayana. 

 Corbiilaria Graelsi. 

 Erytlironium giganteum. 

 ,, rose inn. 



„ Nuttalliamun. 



Gentiana verna testiva. 

 Narcissus Bull)()Codiuin. 



,, bicolor and vars. 



Narcissus Fiystcttensis. 

 ,, incomparabilis 



vars. 

 ,, rupicola. 



„ triaiidru3. 



Petrocallis pyrenaica. 

 l\)lygala (Jlianiicbiixus. 



,, ])iir|)urea. 



I'liinula ciliata j)urpurata. 

 ,, decora. 

 ,, mistassinica. 

 „ casliiniriuna. 

 Soldanella inoiitaiia. 

 Trillium grand iflonim. 

 Tulipa pulcliella, &c. 



and 



Of ilic, fV)rty sjiring llowcring plants ainiually recorded to 

 show tlieir jnuiods of llowering, nine came into ilower, thus 

 fomplcting tlic list for the thirty-eighth year. 



