Bradford White Corp. v. Aetna Insurance Company, 372 So.2d 994 (Fla. 3d DCA 1979). See also Youngblood v. Citrus Associates of the New York Cotton Exchange, 276 So.2d 505 (Fla. 4th DCA 1973), cert. denied, 285 So.2d 26 (Fla. 1973); Lyster v. Round, 276 So.2d 186 (Fla. 1st DCA 1973), cert. denied, 283 So.2d 105 (Fla. 1973); Goffer v. Weston, 217 So.2d 896 (Fla. 3d DCA 1969). It is clear that the burden is upon the plaintiff to sustain the validity of such service when he seeks to invoke the jurisdiction of the court, Youngblood v. Citrus Associates of the New York Cotton Exchange, supra, and he must plead sufficient facts to justify the application of the statute in order to withstand a legal challenge to such service. Chase Manhattan Bank v. Banco Del Atlantico, 343 So.2d 936 (Fla. 3d DCA 1977).

Therefore, we determine that the requirements of doing business and connexity as delineated in Florida Statute § 48.181 (1971), F.S.A., must be read in pari materia with Florida Statute § 48.081 (1971), F.S.A. Our determination is supported by other Florida cases which have resolved similar problems. See Gordon v. John Deere Co., 320 F. Supp. 293 (N.D.Fla. 1970); Illinois Central Railroad Co. v. Simari, 191 So.2d 427 (Fla. 1966); Zirin v. Charles Pfizer Co., 128 So.2d 594 (Fla. 1961); Eder Instrument Co. v. Allen, 253 So.2d 902 (Fla. App. 1971); Kastan v. Kastan, 222 So.2d 55 (Fla.App. 1969); Goffer v. Weston, 217 So.2d 896 (Fla.App. 1969); Manus v. Manus, 193 So.2d 236 (Fla.App. 1966); Amphicar Corporation of America v. Gregstad Distributing Corp., 138 So.2d 383 (Fla. App. 1962). See also Bayitch, Conflict of Laws, Florida 1968-69, 24 U.Miami L.Rev. 434, 450-53 (1970).