41. Blackstone No. 1.

 My interpretation:
  2.25 oz Uncle Val’s Restorative Gin
  0.75 oz Martini & Rossi Rosso

Shake with cracked ice, strain. Squeeze lemon peel and use for garnish. Another “Martini” variation named for the Chicago hotel (see Blackstone, Blackstone No. 2). In Jack’s 1916 edition, following Straub (1914) he calls for Old Tom Gin.