In Martinelli v. California Pacific Title Ins. Co., 193 Cal. App. 2d 604, 607 [14 Cal. Rptr. 542], it is said: "Such intention or understanding may be shown by circumstances as well as by declaration." (See also on the general subject: Turknette v. Turknette, 100 Cal. App. 2d 271, 279 [223 P.2d 495]; Huber v. Huber, 27 Cal. 2d 784 [167 P.2d 708]; Edwards v. Deitrich, 118 Cal. App. 2d 254, 259, 260 [257 P.2d 750]; Tomaier v. Tomaier, 23 Cal. 2d 754 [146 P.2d 905]; Trimble v. Trimble, 219 Cal. 340 [26 P.2d 477]; Hibernia Sav. & Loan Society v. DeRyana, 210 Cal. 532 [292 P. 632]; Salveter v. Salveter, 206 Cal. 657 [275 P. 801]; Estate of Kelpsch, 203 Cal. 613 [265 P. 214]; Hammond v. McCollough, 159 Cal. 639 [115 P. 216]; Fanning v. Green, 156 Cal. 279 [104 P. 308]; Title Ins. & Trust Co. v. Ingersoll, 153 Cal. 1 [94 P. 94]; Perdicalis v. Perdicalis, 92 Cal. App. 2d 274 [206 P.2d 650]; Bassi v. Bassi, 89 Cal. App. 2d 886 [202 P.2d 96]; Luminoso v. Luminoso, 75 Cal. App. 2d 472 [171 P.2d 516]; Estate of Wilson, 64 Cal. App. 2d 123 [148 P.2d 390]; Horsman v. Maden, 48 Cal. App. 2d 635 [120 P.2d 92]; Cox v. Cox, 82 Cal. App. 2d 867 [187 P.2d 23].)